Turtle portrait

I got this shot at the Texas State Aquarium in Corpus Christi, TX.  I spent a while walking around to the different viewing windows at the turtle enclosure, as the turtles were definitely on the move.  I found it rather hard to get a nice crisp image, since they were in motion and I was shooting through thick glass, but I thought this one came out alright.  It would be really interesting to see one of these closeup in the wild!